code: def optional_get_element_reference_implementation(
      optional: Optional[Any],
  ) -> Any:
      assert optional is not None
      return optional
  
file_path: onnx/onnx/backend/test/case/node/optionalgetelement.py
imports: from typing import Any, Optional
  import numpy
  import onnx
  from onnx.backend.test.case.base import Base
  from onnx.backend.test.case.node import expect
label_desc: Use image node_id 1 for calling a global function with example usage: optional_get_element_reference_implementation(optional) and returns: optional